add demo limit app.py

app.py

@@ -119,9 +119,8 @@ with gr.Blocks(theme=theme, css=css) as demo:
 
   change_model_button.click(dc.change_llm,[repo_, file_, max_tokens, temperature, top_p, top_k, repeat_penalty, max_docs],[model_verify])
   falcon_button.click(dc.default_falcon_model, [], [model_verify])
-import langchain
-print(langchain.__version__)
-print(gr.__version__)
-print(param.__version__)
+
+
+DEMO = os.getenv("DEMO")
 print(DEMO)
 demo.launch(enable_queue=True)